Elevator safety appliance.



J. PLYM.

ELEVATOR SAFETY APPLIANCE.

APPLICATION FILED APR, 23. I9I7,

1,278,380, Patented Sept. 10,1918.

2 SHEETS SHEET I.

4& 11 1% ATTORNEYS.

J. PLYM.

ELEVATOR SAFETY APP-NANCE.

APPLICATION FILED APR.23. 19w.

Patented Sept. 10, 1918.

2 SHEETS-SHEET 2.

A TTORNEYS.

- matically stoppirlg tor cage or car the invention;

JOHN PLYM, OF ARGO, ILLINOIS.

ELEVATOR SAFETY APPLIANCE.

To all whom it may concern: 7

Be it known that 1, JOHN PLYM, a subject of the King of Sweden, residingat Argo, in the county of Cook and State of Illinois, have invented newand useful Improvements in Elevator Safety Appliances, of which thefollowing is a specification.

This invention relates to devices for autoand supporting an elevator caror cage in the event of breakage or failure of the usual hoistingcables, and the invention has for its object to provide a novel andimproved device of the kind characterized by a catch or brake devicewhich is brought into engagement with the In order that the inventionmaybe better understood, reference is had to the accompanying drawingsforming a part of this specification and in said drawings- Figure 1 is afront elevation of an elevashowing the application of Fig. 2- is a sideelevation thereof;

Fig. 3 is a plan view of a portion of the mechanism; and

Fig. 4 is an enlarged section on the line 4 1 of Fig. 1.

s On the top 5 of the cage, in

Referring specifically to the drawings, 5 denotes the top, 6 the floor,and 7 the sides of an elevator cage or car of conventional.

construction. The cage is supported by hoisting cables 8 connected tothe topthere- -of and operated in any suitable manner.

Two pairs of cables are prov1ded, one pair, as usual, beingcounterweighted, and the other pair being connectedv to the hoistingmechanism. As this arrangement is well known, a further description isdeemed unnecessary; nor has the hoisting mechanism been shown as itforms no part of the present invention.

proximity to the cables 8, is mounted a series of fulcrum bearings 9 fortrip levers .10, one for each cable, one end of the levers beingapertured and the cables passing through said apertures. ,The oppositeend of each lever is pressed upward by a heavy expanding coil .spring11. The levers are plvotally mounted to swing in a vertical plane,and'when guide or safety rail alongside the car, and which is controlledby the hoisting cables.

22 with the rails 21,

Specification of Letters Patent. Patented Sept, 10, 1918,

Application filed April 23, 1917. Serial No. 163,910.

On the top 5 of the cage are also mounted bearings 12 supporting a rockshaft 13 of rocker arms 13 The rocker arms 13 10 which is provided witha series and a rocker arm 13. rest onthat end of the levers pressed bythe springs 11, and to the rocker arm 13 is connected a rod 14 whichextends downward alongside the car. The rod is also provided with ahandle device 14; for manual actuation, and a turn-buckle 14: foradjustment and for taking up slack.

The lower end of the rod 1 1 is connected to a rocker arm 15 on a shaft15 supported eccentric brake shoes 22 having a toothed or serratedperiphery. These brake. shoes arepositioned opposite the rails-21 tocome into frictional engagement therewith'when the shaft 18 is rocked.The brake shoes are normally clear of the rails.

In order to rock the shaft 18 to apply the brake shoes 22, said shaft isfitted with outstanding arms 23 which are engaged by coiled springs 24:positioned between said arms and the cage bottom 6. The shaft is T-rails21 mountlocked by the parts 15 and 16, and the latter, in turn, arecontrolled by the cables 8 through the parts 10, 13, 13, 13? and 1% Itwill be understood from the foregoing if the cables 8 should break orfail from any cause, the springs 11 will rock the levers 10, whereupon,through the parts 13,13 and 13", the rod 14 is drawn upward, and as saidrod is connected to the detent 15" the latter is tripped off the tooth16 of the collar 17 The shaft 18 is now released, and the springs 24rockthe same to engage the brake shoes whereupon the cage is brought to astop. As each cable 8 is independently connected to a lever 10, thebreaka e or failure of anyone of the cables will bring the safety deviceinto action.

The shaft 18 is supported in bearings 25 slidably mounted on a support25", and engageable by a screw 26, by whlch-"latter the bearing may beadjusted advance the shaft and thus compensate for Wear of the brakeshoesQQ. The adjusting screw 26 is threaded through a block 27 on thesupport I claim.

1. The combination with an elevator cage, and a plurality of hoistingcable's therefor; of a brake mechanism carried by the cage, actuatingmeans for said mechanism, a means for holding the brake mechanisminactive, trip levers carried by the car and having independentconnections with the respective cables, means for tilting said leverswhen released by thecables, a rock shaft having rocker arms which areengageable by the trip levers, and a connection between therock shaftand the aforesaid holding means.

2. The combination with an elevator cage, and a plurality of hoistingcables therefor;

of a rock shaft carried by the cage, means for actuating said shaft,brake shoes carried by the rock shaft, means for locking the rock shaft,trip levers carried by the cage and having independent connections withthe respective cables, means for tilting said levers when released bythe cables and a connection between the levers and the aforesaid shaftlocking means.

3. The combination with an elevator cage, and a plurality of hoistingcables therefor; of a rock shaft carried by the cage, means foractuating said shaft, brake shoes carried by the rock shaft, means forlocking the rock shaft, trip levers carried by the cage and havinindependent connections with the respective cables, means for tiltingsaid levers when released by the cables, a rock shaft having rocker armswhich are engage able by the trip levers, and a connection between thelast mentioned rock shaft and the aforesaid shaft locking means.

- 5. The combination wi h an elevator cage,"

and the hoisting cable thereof; of a rock shaftcarried by the cage,means for actuating said shaft, a brake shoe carried by the rock shaft,means for locking said shaft, a trip lever carried by the cage andhaving a connection with'the hoisting cable, means for tilting saidlever when released by the cable, a rock shaft having a rocker arm whichis engageable by the trip lever, and a connection between the lastmentioned rock shaft and the aforesaid shaft locln'ng means.

In testimony whereof I afiix my signature.

JOHN lLYM.

